Blowgun



May 18, 1954 E. H. GREWE ET AL BLOWGUN Filed May 28, 1952 ATTORNEYSPatented May 18,1954

BLOWGUN Edward H. Grewe and Otto C. Schilling, Milwaukee, Wis.

Application May 28, 1952, Serial No. 290,596 2 Claims. (01. 299-450)This invention appertains to a novel blow gun for delivering fluid underpressure to a desired point for cleaning castings, machine parts andthe'like.

One of the primary objects of the invention is to provide a blow gunembodying a casing for connection at its inner end with a hose orconduit for compressed air and having a stationary nozzle at itsopposite end for delivering the air to a desired point, with a valveindependent of the nozzle and completely housed within the casing forcontrolling the flow of air through the casing and to the nozzle, soarranged that the valve can be readily actuated by a thumb pieceextending along the casing,

Another salient object of the invention is the provisionof means forarranging the valve 1ongitudinally in the casing parallel with, butseparate from, the nozzle, whereby the nozzle, in case of emergency, canbe replaced without disturbing the valve and whereby the valve can bereplaced when worn without disturbing the nozzle.

A further object of the invention is the provision of a blow gunembodying a casing having a valve seat therein at one side of thepassage leading to the nozzle, with a valve body for said seat having alongitudinally extending valve stem projecting beyond the forward end ofthe casing at one side or the nozzle and carrying a replaceable wearhead and stop, with a lever pivoted to the casing and extending alongside of the casing and straddling the nozzle engaging the wear and stophead, so that the valve can be readily actuated from the lever.

A still further important object of the invention is the provision of ablow gun of the above character which is so designed as to reduce theleakage of air to a minimum and one which can be manufactured andmaintained in working condition at a minimum cost.

With these and other objects in view, the invention consists in thenovel construction, arrangement and formation of parts, as will behereinafter more specifically described, claimed, and illustrated in theaccompanying drawings, in which drawings:

Figure 1 is a side elevational view of the air gun;

Figure 2 is a central longitudinal sectional view through the blow gun;

Figure 3 is a transverse sectional view through the blow gun taken onthe line 3-3 of Figure 2, looking in the direction of the arrows andillustrating more particularly the arrangement of the operating lever orthumb piece; and

Figure 4 is a transverse sectional view through the gun taken on theline 4-5 of Figure 2 looking in the direction of the arrows,illustrating the arrangement of the air passage way for the nozzle andthe control passage way.

Referring to the drawingsin detail, wherein similar reference charactersdesignate corresponding parts throughout the several views, the letter13 generally indicates the blow gun and the same includes a casing 5having a body portion 8. This body portion 6 can be formed in the natureof a casting and the same is threaded into a shell I. This shell i canbe of a polygonal shape to facilitate the turning thereof. The rear endof the shell is interiorly threaded as at 8 or otherwise iormed toreceive a coupling for a hose or other conduit for compressed air. Thebody portion 8 terminates short or" the rear end of the shell 1' toprovide an interior chamber 9. The body 8 at one side of itslongitudinal axis is provided with a longitudinally extending passageway It] and this passage way opens out through the forward end of thebody portion 6 and terminates short of the rear end of the body portionas is best shown in Figure 2. The forward end of the wall of the passageway It is preferably interiorly threaded for the reception of anelongated discharge nozzle H. The body 6 is also provided with a passageway [2 which opens out through the rear end of said body portion andinto the chamber 9. The wall of the passage way l2, at its rear end, canbe ground to provide a valve seat l3 and it is to be noted that thepassage way i2 is at one side of the passage way it and that the passageways It and I 2 have communication forwardly of the valve seat :3 by aport It.

Slidably mounted in the body portion 6, is a valve stem [5 and the bodyportion is provided with a bore it for receiving the stern and thesliding fit between the stem and the wall of the bore is such that aminimum of leakage of air wil1 take place around the stem. The inner endof the stem it has detachably fitted thereon, a valve body I! for snuglyfitting on the seat l3 to normally prevent the flow of compressed airfrom the chamber 9 into the passage Way l2. Upon wear, the valve body I!can be easily replaced.

The forward end of the stem 15 projects beyond the forward end of thebody portion 6 and has detachably fitted thereon, a wear and stop headI3. Normally, air pressure within the chamber 9 holds the valve body I!on its seat and the wear and stop head forwardly of the front face orthe body portion 6. Upon inward movement of the valve stem 15, the wearand stop head will engage the forward face of the body portion 6 to actas a stop and a further seal for the bore I6 and the valve body I! willbe moved off of its seat for permitting the free flow of air into thepassage way |2 and thence into th passage way I3 to the nozzle Means areprovided for insuring the easy and quick actuation of the valve stem l5and this means includes an angular shaped lever |9 having a rearwardlyextending finger or thumb actuating portion 20 which extends along sideof the body portion 6 and the shell 1. The lever also includes a frontportion 2| which extends across the front of the body portion 6 and thisfront portion 2| is provided with an opening 22 which receives thenozzle H and so that the lever can have free movement relative to thenozzle. The extreme outer end of the front portion 2| is pivoted as at23 to a forwardly projecting ear or lu 24 which can be welded orotherwise fastened to or formed on the body portion 6. This frontportion 2| of the lever l9 engages the wear and stop head l8 as can beseen by referring to Figures 1 and 2.

In use of the improved gun and with the gun connected to a hose, the gunis taken in the hand of an operator with the nozzle directed toward thepoint to be cleaned and the thumb or other finger of the operator isused to depress and move the thumb and finger portion 2|! toward thecasing, rocking the lever it on its pivot 23 and forcing the valve steminwardly. This permits the free flow of air through the casing andnozzle and upon release of pressure on the thumb or finger piece 20, thevalve body I! will be instantly moved on its seat again by air pressure.

From the foregoing description, it can be seen that an exceedinglysimple and durable air gun has been provided, in which the leakage ofair is reduced to a minimum and in which all parts can be quicklyreplaced in case of wear.

Changes in details may be made without departing from the spirit or thescope of this invention, but what is claimed as new is:

l. A blow gun comprising a casing having an interior compressed airreceiving chamber and a longitudinally extending passage way opening outthrough the forward end of the casing and completely closed to thechamber and terminating short of the chamber, a nozzle carried by theforward end of the casing and communicating with the forward end of thepassage way, said casing also having an interior passage way the axis ofwhich is disposed in spaced parallel relation to the first mentionedpassage way and opening into the chamber and a port connectin the twopassage ways together, a valve stem slidably mounted in the secondmentioned passage way extending beyond the forward end of the casing andinto the chamber, a valve body on the inner end of said stem for normallclosing communication between the chamber and the second mentionedpassage way, and an angular lever pivoted to the forward end of thecasing and straddling said nozzle and engaging the forward end of thestem for moving the stem inward and the valve body to an open positionupon actuation of the lever in one direction.

2. A blow gun as defined in claim 1, and a wear and stop head on theforward end of the stem engaging the lever and for engagement with theforward end of the casing when the valve body is in its open position.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 2,469,642 Grewe May 10, 1949 2.5791208 Vreeland, Jr. Dec. 8.1951

